Grinding or polishing machine.



PATENTBD JULY 5, 1904.-

W. V. ROBINSON. GRINDING OR POLISHING MACHINE.

APPLIOA'IION FILED SEPT. 15, 1903.

6 SHEETfl-SHBET 1.

N0 MODEL.

INVENTOR l l lllhriw E55ES .lll'ulll'll lllllll WITN TWILLIAM V ROBSNSON ATT' Y.

PATENTED JULY 5, 1904.

W.-V. ROBINSON. GRINDING 0R POLISHING MACHINE.

APPLICATION FILED SEPT. 15, 1903.

5 SHEETS-SHEET 2.

N0 MODEL.

. Y .T s m A WR P. T w V. M IMMW L M Y a WITNESSLS 5M7.

PATENTED JULY 5, 1904.

W. V. ROBINSON.

GRINDING OR POLISHING MACHINE.

APPLICATION FILED SEPT. 15, 1903.

5 SHEETS-SHEET 3.

NO MODEL.

VV|TNE$5ES INVENTOR \IVILLIAM'V'ROBINSON' &

ATT'Y.

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PATENTED JULY 5, 1904.

W. v. ROBINSON, GRINDING 0R POLISHING MACHINE.

APPLIOATION FILED SEPT.15,1903.

6 SHEETS-SHEET N0 MODEL.

.. 1., i 1;! f Rtliilli N O m R B O NR EV WM w L w W WlTNESSES ATT'Y.

PATENTED JULY 5, 1904.

W. V. ROBINSON.

GRINDING OR POLISHING MACHINE.

APPLIOATION FILED SEPT. 16, 1903.

N0 MODEL.

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WITNESSES INVENTOF? WILLIAM" V- ROBINSON- ATT'Y.

UNITED STATES Patented July 5, 1904.

INILLIAINI V. ROBINSON, OF DETROIT, MICHIGAN.

GRINDING OR POLISHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 764,151, dated July 5, 1904.

Application filed September 15, 1903. Serial No. 173,254. (No model.)

To wZZ whom it may concern.-

Be it known that I, WILLIAM V. ROBINSON, a subject of the King of Great Britain, residing at Detroit, in the county of I/Vayne and State of Michigan, have invented certain new and useful Improvements in Grinding or Polishing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to grinding-machines more particularly designed for use in polishing tubular bodiessuch, for instance, as the pipes used in gas-ranges.

It is the object of the invention to obtain a construction in which the work is automaticallyfed longitudinally and simultaneously revolved while operated upon by the grinder. It is the further object to provide means for readily engaging and disengaging the work for the holders.

The invention consists in the peculiar construction, arrangement, and combination of parts, as will be more fully hereinafter set forth.

In the drawings, Figure 1 is a side elevation of the machine. Fig. 2 is a cross-section thereof. Fig. 3 is a longitudinal section, partly in elevation, through a portion of the machine. Fig. 4c is a plan view of the parts shown in Fig. 3. Fig. 5 is a head end elevation, partly in section, showing drive connections. Fig. 6 is an end elevation of the detachable work-holder. Fig. 7 is a cross-section thereof, showing the intermediate workdrive. Fig. 8 is a plan similar to Fig. 1, illustrating the modified construction. Fig. 9 is an end elevation thereof. Fig. 10 is an end'elevation of the intermediate work-support for the holder. Fig. 11 is a side elevation thereof. Fig. 12 is a sectional elevation illustrating the manner of supporting and driving flexible tubular work. Fig. 13 is a side elevation of the driving-chuck. Fig. 14 is an end elevation thereof. Fig. 15 is an elevation of the guards or protecting-shields used in connection with the grinders. Fig. 16 is a side elevation thereof. Fig. 17 is a cross-section through one of the work supporting wheels. Fig. 18 is a side elevation of the adjustable carriage. Fig. 19 is a cross-section thereof. Fig. 20 is a sectional elevation for the locking device of the adjustable carriage, and Fig. 21 is a section through the blower for cooling the work while being polished.

A is a frame or bed over which the work is fee B designates grinding or polishing wheels, which are journaled in vertically movable bearings above the bed A. As shown, these wheels are journaled at the free ends of pivotal frame O, which are supported at their opposite ends upon a frame D.

E is a counter-shaft journaled in bearings upon the frame D and forming an intermediate drive connection for the grinder-wheels, which latter are connected thereto through the belt connections F.

The machine is preferably provided with a number of the pivotal frames O, each of which carries a grinder or polishing wheel B, and thus the work fed over the bed may be successively presented to grinders and polishers of different grade, thereby completing the polishing from the first operation of roughing out to the last operation of highly finishing.

The frame O, together with the grinders B, are partially counterbalanced by suitable means, such as the levers G, which are connected at one end by links H with the frame O and at the opposite ends to a counterweight I. These counterweights are so adjusted as to be slightly less than sufiicient to completely counterbalance the frames, so that the grinders tend to move downward against the work, pressure being adjusted as desired by changing the weight I. The downward movement of the grinders is limited by the arms J, projecting downward from the frame O and adapted to bear at (1, upon the rail or guide 5 on the bed A.

The work is carried into operative relation to the grinder B by the work holders or carriages, which are adapted to be successively fed along the bed A and to present the work longitudinally to the grinders, while at the same time rotating the work.

The carriages J have a detachable engagement with guideways K, extending longitudinally of the bed, preferably by providing the lugs or flanges 0 on the carriage-frame, which fit in grooves in the guides K. The

carriages are driven by a suitable means, such Each of the carria es J is rovided' with suitable supporting-bearings for the work and also a drive mechanism through which a rotary motion is imparted to the work while operated upon by the grinders.

In the construction shown in Figs. 3, 4c, and 5 the work is supported by roller-bearings, as e e and e and 0 These are formed of disks or wheels loosely sleeved upon axles f, which are in turn supported upon brackets f and projecting upward from the frame of the carriage. The pairs of disks e and a and a are arranged in such relation to each other that the work will rest in the groove between the peripheries of said disks.

For driving the work a rotary spindle or head-stock is arranged in alinement with the groove between the roller-bearings g, which is driven by the gears g and beveled gears g from a drive-gear or sprocket It, the latter being arranged in the vertical longitudinal plane of the carriage. Sprocket it engages with a chain it, which extends longitudinally of the bed and passes around sprockets at opposite ends thereof. This chain is driven at a speed which is different from the speed of the feed-chain L, and the portion of the chain which engages the sprocket preferably travels in the opposite direction from the travel of the chain L by an engagement with the carriages. I

The spindle g is provided with a suitable chuck or engaging device, such as the tapering shank g". This is adapted to enter the end of the tubular work, wlrile the opposite end thereof is engaged with a tail-block vi. To permit of engaging and disengaging the work, the tail-block is movable, and, as shown, it is hinged at Z to the frame of the carriage and is adapted to swing in a vertical plane in order to be in engagement with the end of the work. When in engagement, it is locked in this position by the bolt or catch The tail-block is also preferably provided with a revoluble tapering dollar 7?, supported upon the arm 2' and directly engaging with the end of the work. I

The work-holder as thus far described is adapted for use in connection with tubes or pipes of standard length, which may be engaged with the spindle g and the revoluble collar here the length of the work is less than the distance between the head and tail blocks, two or more sections may be placed in alinenient, said sections being connected to each other through an adjustable intermediate driving connection. This, as shown in Figs. 4 and 7 comprises a bracket M, longitudinally adjustably engaging the frame of the carriage, as by means of the lugs Zn, engaging with grooved guides Z:. This bracket has journaled at its upper end a revoluble spindle H, which is provided at opposite ends with chucks or tapering shanks Zffor respectively engaging the ends of the adjacent tubes. With this attachment a plurality of sections of the work may be simultaneously driven, the first section through the medium of the revoluble spindle g and the succeeding sections through the medium of an intermediate drive-spindle 711 the last section engaging with the tail-block 2'.

Instead of the construction of carriage and drive mechanism above described I may employ other equivalent devices-such, for instance, as is illustrated in Figs. 8 and 9. In this construction the beveled gears g are dispensed with; also the sprocket h and chain h. In place a revoluble shaft Z is journaled in bearings to extend longitudinally of the frame A and is driven by suitable connections, such as the beveled gears Z.

Z is a disk or friction-wheel journaled on the carriage-frame, connected by the gears Z? and Z with the drive-spindle g. This friction-Wheel Z is adapted in the longitudinal movement of the carriage to frictionally engage with the shaft Z, so that the rotary movement of the latter will cause a rotary driving of the former and through the medium of the gears will revolve the spindle g.

In order that the wheel Z may be yieldingly pressed against the shaft Z to avoid binding, a spring-pressed roller-bearing m is arranged to engage with the opposite side of the carriage-frame to press the latter toward the shaft Z. This spring-pressed gear comprises the antifriction-roller m, journaled in the free end of the pivotal a'rm m, which latter is actuated by the spring on", a stop m being provided to limit its movement.

For general work where tubes of various lengths are to be ground or polished I preferably provide a carriage-frame which is longitudinally adjustable, so that the head and tail blocks may be shifted in relation to each other. Such construction is illustrated in Figs. 18 and 19, in which n is one section of the carriage frame, which telescopically engages with another section, 12. The two sections are locked in various positions of adjustment by means of a spring-pressed belt a, as illustrated in Fig. 19.

I/Vhere the length of a tubular work is considerable, it is desirable to provide intermediate supports, which prevent lateral deflection during the operation of the grinders. As

shown in Figs. 10 and 11, the work is supported by the intermediate roller-bearings e which are journaled in abracket 0, the wheel being longitudinally adjustably secured in.

guides 0' on the carriage-frame.

- In Fig. 12 a modified construction is shown, in which the work is internally supported by means of a mandrel N. As shown, this comprises the head P, adapted to engage with a tapering shank g of the drive-spindle. This head is formed in two sections P and P which are loosely secured to each other by pins or rivets P Sufiicient movement is procured between the two sections to allow the A not only is the work presented to the grind-I ers, but the driving and supporting spindles must also successively pass beneath the grinders. It is further necessary to provide means of protecting the spindles and their drive-gear from injury by the grinder-wheels. This is accomplished by providing each carriage with cams O, which are adapted to engage with the arms J, depending from the frame C. As shown, the lower end of the arm J carries an antifriction-roll 1', which in the travel of the carriage will mount up the cam 0, thereby lifting the frame C and the grinder B thereof. The cams O are arranged at such points on the carriage as to lift the wheels out of engagement with the driving and supporting spindle. These cams are also arranged to lift the grlnders when it is desired to leave a portion of the work ungroundas, for instance,

the threaded ends of pipe-sections.

For polishing tubes, especially where made of brass or other comparatively soft metal, it is desirable to provide a roller-support which will not mar the work. To this end the rollerbearings e e and e and e are faced at the periphery by a soft material, such as leather, as indicated by s, Fig. 15. To prevent the abrasive material used in polishing from collecting on these faces, and thus scratching the work, shields z, are arranged to cover the upper portion of the roller bearings. These shields extend in close proximity to the work and are provided at their inner ends with buffers of leather or other soft material, which prevent injury to the work in case it is passed in contact to the shield.

To prevent overheating of the work during operation of the grinder, an air-conduit Q is arranged with discharge-nozzles R, which are directed against the work adjacent to the grinders.

The construction of the machine being as described,the operation is as follows: The carriages J when not in use are detached from the bed and drive-chain L. When thus detached, the workto be polished may be placed on the carriage and connected with the driving-spindles and tail-block in the manner before described. The operator then takes the carriage, with the work secured thereon, and

engages the lugs 0 with the Ways K and'at. the same time engages the bifurcated lug d.

with one of the links of the chain L. The movement of the chain will then feed the carriage along the ways and will present the work sue-- cessively to the grinder B. During thetravel of the carriages along the bed the sprockets h, engaging with the chain h, will be revolved,

communicating their motion to the gears g and g and to the rotary spindles g, Whichlatter will revolve the work, as has been already.

described. In passing the grinders the latter will be lifted by the cams O to avoid engagement with the drive-spindles and threaded portions of the work and will then be permitted,

to bear upon the work while traveling thereby. When the end of the bed A is reached, the carriages will automatically disengage fromthedrive-chain, and the operator may then draw them out of engagement with the ways to remove the finished work and replace it by other work to be ground.

WVhat I claim-as my invention is 1. A grinding machine, comprising a grinder, a traveling carriage having an unrestricted movement in either direction longitudinally of the machine, a revoluble Workholder,"mounted on said carriage, and means for communicating rotary. motion to said work-holder during the longitudinal move- 1 ment of saidcarriage.

havingan unrestricted movement in either.

direction longitudinally of the machine, detachably engaging said bed, a-revoluble workholder mounted on said carriage, means for feeding the carriage along said bed, and for.

simultaneously imparting a rotary movement to said Work-holder.

3. In a grinding-machine, the combination with a grinder, a traveling carriage, a rollersupporting bearing for the work upon said carriage, and a revoluble spindle for engaging the work when supported on said bearing, and means for communicating rotary motion to said spindle during the traveling of said carriage.

4:. In a grinding-machine, the combination of a traveling carriage, a roller-supporting bearing for the work mounted on saidcarriage, a revoluble head-spindle for engaging the work at one end thereof, and tail-spindle for engaging the opposite end of the work,

and means for imparting rotary motion to said head-spindle during the travel of the carriage.

5. In a grinding-machine, the combination of a traveling carriage, a roller-supporting bearing for the work mounted on said carriage, a revoluble head-spindle on said carriage adapted to engage with one end of the work, a tail-spindle for engaging with the opposite end of the work, means for adjusting said tail-spindle for engaging or disengaging the work and means for driving said headspindle during the travel of the carriage.

6. In a grinding-machine the combination with a traveling carriage, of a revoluble worksupport mounted thereon, and comprising spindles for engaging the opposite ends of the work and adjacent roller-bearings, and an intermediate supporting-bearing for the work, detachably engaging said carriage.

7. A grinding-machine, the combination of a traveling carriage, of a revoluble work-support thereon, comprising head and tail spindles for engaging opposite ends of the work, a roller-supporting bearing adjacent thereto, and an intermediate revoluble spindle adapted for engagement with the adjacent ends of sections of the work, respectively engaging the head and tail spindle.

8. In a grinding-machine, a traveling workcarriage formed in extensible sections, means for locking the same in their adjusted positions, and revoluble work-supporting bearings on the respective sections for engaging with opposite ends of the work.

9. In a grinding-machine, a traveling carriage comprising a telescopic frame, rollerbearings mounted on the adjustable sections of said frame, head and tail spindles respectively adjacent to said roller-bearings on the respective sections, a means for driving the head-spindle during the travel of the carriage.

10. In a grinding machine, the combination with abed of a carriage adapted to travel along said bed, a revoluble work-holder on said carriage, a grinder above said bed, yieldingly pressed against the work on said carriage, means of operating upon the travel of said carriage past said grinder for automatically lifting the latter at the end of the work to clear the revoluble holder.

11. In a grinding-machine, the combination witha bed of aearriage adapted to travel along said bed, a rotary work-holder on said carriagc, the grinder yieldingly pressed toward the work on said carriage, and a cam operating upon the movement of said carriage, to lift said grinder out of operative relation to the work.

12. In a grinding-machine, the combination with a bed of a carriage adapted to travel over said bed, a revoluble Work-holder, supported on said carriage, a grinder vertically movable above said bed, an arm depending from said. grinder adapted to limit the downward movement thereof, and a cam on said carriage for lifting said arm for engaging or disengaging the same from the work.

13. In a grinding-machine, the combination with a traveling carriage of a roller-support for the work thereon, and shields covering the bearings of said supports adjacent to the work.

14. In a grinding-machine, the combination with a grinder, of a traveling carriage, rollerbearings on said carriage upon which the work rests intermediate its ends, and a grinder above said bearings yieldably pressed against the work on said carriage.

15. In a grinding-machine, the combination with a grinder, of a traveling detachable carriag'e, roller-bearings on said carriage, upon which the work rests, and a grinder above said bearings yieldably pressed against the work on said carriage.

16. In a grinding-machine, the combination with a bed, of a carriage adapted to travel over said bed, a drive-chain for the carriage, and a detachable connection between the carriage and drive-chain whereby the former will automatically disengage from the latter at the end of the machine.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM V. ROBINSON.

Witnesses:

H. 0. SMITH, J AS. P. BARRY. 

